The 40-Pushup Challenge: Master Them and Add Years to Your Life - Men's Journal

Plyo Pushups: Benefits, How-to, and Variations

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How many push-ups should you do in a day? - Times of India

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Push-up Progression: A 24 Push-up Journey to Stabilization, Strength, and Power: Zetlin, Shaun: 9781932549850: : Books

The 40-Pushup Challenge: Master Them and Add Years to Your Life - Men's Journal

Harvard: Men who can do 40 pushups have a 'significantly' lower risk of heart disease - Big Think

I Did Pushups Every Day for a Month—Here's What Happened

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Men who can do 40 push-ups are less likely to have heart disease: study

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How to Do 1,000 Push-ups in a Single Day, by Kori D. Miller